Tread and riser stair gauge



FIG. 1 is a top and left front perspective view of a tread and riser stair gauge showing my new design;

FIG. 2 is an enlarged top plan view thereof showing the left-center portions with the ends broken away for ease of illustration.

FIG. 3 is a right end elevational view thereof;

FIG. 4 is a left end elevational view thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a tread and riser stair gauge, as shown and described above. 